Gauge-recording device for wire-drawing machines



J. GURNE Dec. 6, 1932.

GAUGE RECORDING DEVICE FOR WIRE DRAWING MACHINES Filed March 13, 1931 50 1L d O "W. J I W/\r ii 1 t f W3. Q a

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GAUGE-RECORDING DEVICE FOR WIRE-DRAWING nonnrss Application fled luck18. 1081, Serial 10. 582,408, and in France larch 80, 1830.

The present invention relates to a gaugerecording device forwire-drawing machines and has for its primary object to rovide a devicewhich will accurately record or register minute inequalities in thediameter,

gauge, roundness or hardness of the wire.

A further object of the invention is to rovide a device of thischaracter capable 0 recording or indicating in a hi hly legible way 1minute inequalities in the iameter, gauge,

roundness or hardness of the wire, the indication furnished by thisdevice being in the form of a line traced on a sheet of paper or similarrecording material and giving a vivid illustration of the inequalitiesin question which makes it possible to readily locate those lengths orportions of the drawn wire presenting said inequalities. The ability tolocate these unequal portions of the wire and throw them away at will isvaluable for many pur oses such for example as the making of carclothing wires.

A still further ob'ect of the invention is to provide a device 0 theaforesaid character associated with the die of a wire-drawing machinefor recording in a magnified way minute inequalities in the diameter,gauge, roundness or hardness of the wire, said inequalities bein of theorder of one hundredth of a mil imeter, thus making it possible todiscard those ortions of the wire which suffer from sai inequalities toput on the market a perfectly gauged wire.

Still a further object of the invention is to provide a device of thecharacter set forth of simple and rugged construction involving springsadapted to elastically sustain the tractional stresses undergone by thedie through which the Wire is drawn, thereby 0 avoiding any jerks due tothe varying resistance offered b said wire.

With these an such other objects in view as will incidentally appearhereafter, the invention comprises the novel combination and arrangementof parts that will now be described in detail, reference being had tothe accompanying dlagrammatic drawing which shows non-l1m1tatively one,of the various mechanlcal forms in which the principle of the inventionmay beemployed.

In the drawing:

Figure 1 is a fragmentary top plan view showing the wire-drawing machinecomprisingthe elastically held die through which the wire is drawn andthe gauge-recording device associated with said die.

Figure 2 shows on an enlarged scale the record line illustrating theevenness of a wire drawn in a machine like the one shown in Fig. 1. 7

Figures 3, 4 and 5 are representations similar to Fig. 2 but assumingthe wire that has been drawn to shown certain inequalities that areregistered and magnified in a highly legible and striking way by eachrecord line.

Reference being first had to Fig. 1, a designates the wire, I) the drumon which said wire is wound after being drawn, a an arrow showing thedirection in which the wire travels under traction from a conventionalfeedin source (not shown) towards said drum, 5 the die through which thewire is drawn, the gau e of the die opening being reckoned according topractical requirements.

The die dis elastically connected to the stationary bracket 0 through apair of coil springs f, f of suitable length and resiliency and highresponsiveness or sensitiveness to inequalities of traction for allowingproper longitudinal displacements of the die d as will be statedhereafter. The springs, f, f are secured at i, i on the bracket 6 and atj, j on the die holder Z. Intermediate said springs may be located inthe usual way a cup (not shown) containing lubricant through which thewire a passes.

Opposite the die holder Z but laterally thereof is positioned a drum mto which is imparted in any convenient way a uniform rotational motion.For example, this drum m may be supported by an arbor a to which iskeyed a gear t meshing wlth a gear u keyed to an arbor 'v driven by anactuating mechanism W of any approved nature, such as for example aclockwork mechanism or an electric motor the actuation of which may besynchronlzed with the actuation of the wire drawin machine itself, andwill cause stoppage 0 the drum m when said machine is stopped. The drumm is fitted with a sheet of paper or equivalent writing or recordingsurface. A stylus a secured to the dle holder Z is so associated withthe recording drum m as to have its end or nib constantly contactingtherewith during the wire drawing operation. v

The operation of the gauge-recording device is as follows: Assuming thewire a that is being drawn to have such a texture or cross sectionaloutline throughout its len th as to always offer the same resistance tot e die (Z, the tensile elongation of the coil sprlngs f, f holding thedie holder Z with respect to the supporting bracket 6 will be constant,whereby the stylus o rigidly connected to said die holder will trace onthe paper or other cover ing of the rotary recording drum 1) arectilinear line p such as the one shown in Flg. 2.

Should now a single inequality in the hardness, roundness, gauge orother characteristic of the wire a that is being drawn meet the die, d,the tensile elongation of the coil springs f, f will at once vary, thelength of said springs decreasing or increasing depending on theinequality in question involving less or more resistance to the drawingoperation. The stylus 0 will therefore write. i. e. register saidinequality of resistance in an 11- lustrative way on the covering of therecording drum m as shown for example at gun Fig. 3. The shape ofthetooth, notch or n1ck 9 thus produced on the straight record line p willgive a true illustration of the extent of the inequality of the wire bywhich it will be possible to readily locate and discard the faulty ordefective portion of the wire a, for example by immediately stopping themachine and eliminating said portion.

Similarly, a series or sequence of inequalities in the wire a that isbeing drawn will produce an irregular line showing a succession of peakssuch as the ones shown at r in Figures 4 and 5.

It will thus be seen that the invention provides a highly sensitivegauge-recording device for wire-drawing machines which by a properselection of the tensional characteristics of the springs f, f will givea true and very legible illustration of any minute inequality inhardness, roundness or cross sectional area liable to occur in a wire inthe course of drawing even in the case of extremely thin wires orfilaments such as calibrated wires, wires used for the making of cardclothing or wires necessitating a subsequent annealmg. i

As above stated, the responsiveness and accuracy of the device permitsthe disclosure of inequalities in the diameter of the wire down to onehundredth of a millimeter. This result has never been attained bypreviously proposed devices which were much more complicated. Theattainment of this novel result in the present device must be ascribedto the gauge, diameter, roundness or hardness of the wire submitted tothe drawing operation and comprising stretchable spring means connectingthe die holder to a stationary part of the machine, said spring meansbeing so arranged as to undergo elongation by the drawing of the wireand being highly responsive and sensitive to the varyin resistanceoffered by the die to the passing of the wire therethrough, a recordingelement directly associated with the die holder, and a member having arecording surface associated with the recordin element, said memberbeing movable uni ormly throughout the drawing operation, and means foreffecting such movement.

2. In combination with a wire-drawing machine having a die holdermovable in a direction in which the wire is fed and in the reversedirection and a die carried by said die holder, a device forautomatically record ing any minute inequality in the gauge, diameter,roundness or hardness of the wire submitted to the drawing operation andcomprising stretchable coil springs connecting the die holder to astationary part of the machine, said springs being so arranged as to besubmitted to elongation by the drawing of the wire and being of acharacter highly responsive and sensitive to the varying resistan'ceoffered by the die to the passing of the wire therethrough, a recordingstylus rigidly fastened to the die holder, and a rotatable member havinga recording surface associated with the stylus, said member beingrotatable uniformly throughout the drawing operation, and means forrotating said member.

3. In combination with a wire-drawing machine having a die holdermovable in a direction in which the wire is fed and in the reversedirection and a die carried by said die holder, adevice forautomatically recording any minute inequality in the gauge, diameter,roundness or hardness of the Wire submitted to the drawing operation andcomprising stretchable coil springs connecting the die holder to astationary part of the machine,

said s rin be so arranged as to be submittetf to fiiongt lon by thedrawing of the wire and being of a character highly responsive andsensitive to the va ing resistance offered by the die to the passing ofthe wire therethrough, a recording stylus rigidl fastened to the dieholder and rojectmg eterally thereof, and a rotatab e drum covered witha recording surface associated with the stylus, said drum beingrotatable uniformly throughout the drawing operation, and means forrotating said drum.

In testimony whereof I aflix my signature.

JEAN GURNE.

